Flash movie not showing

Hi - my flash movie situated on http://www.malgosiastepnik.com/ sometimes doesn't load - it comes up as a blank white page. This is an intermittent problem and therefore I'm having problems solving it.

Has anyone ever had something like this? It's 809k in size, is that too much? Any ways to troubleshoot?

It doesn't always happen for me, but I think it only occurs in Firefox. It occurs on both PCs and Macs.

Any tips or helpful ideas would be really appreciated! Thanks

loads fine for me on all browsers, might wanna try adding a preloader? your embed code looks ok.